A patient with vestibular schwannoma is best investigated by which of the following:
**Core Concept**
Vestibular schwannoma, also known as acoustic neuroma, is a benign tumor arising from the Schwann cells surrounding the vestibular nerve. The primary goal of investigation is to diagnose and assess the tumor's size, location, and potential impact on surrounding structures.
**Why the Correct Answer is Right**
The correct investigation for vestibular schwannoma is MRI with gadolinium enhancement. This imaging modality provides high-resolution images of the internal auditory canal and cerebellopontine angle, allowing for accurate visualization of the tumor's size, location, and relationship to surrounding structures. Gadolinium enhancement highlights the tumor's vascularity and can help differentiate it from surrounding neural tissue. **Option C** is the correct choice because MRI is the imaging modality of choice for vestibular schwannomas due to its superior soft-tissue resolution and ability to visualize small tumors.
**Why Each Wrong Option is Incorrect**
**Option A:** CT scans are not the preferred imaging modality for vestibular schwannomas due to their limited soft-tissue resolution and inability to visualize small tumors.
**Option B:** Angiography is not a primary diagnostic tool for vestibular schwannomas, although it may be used in some cases to assess tumor vascularity or plan surgical intervention.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that vestibular schwannomas are typically slow-growing and may remain asymptomatic for years. Early diagnosis and treatment can help preserve hearing and prevent complications such as cranial nerve compression or hydrocephalus.
**Correct Answer: C. MRI with gadolinium enhancement**